Bond coat shall be applied to the taper before the adjacent lane is placed. Structures located in the roadway should have the top of the cover flush with the wearing surface when the final compaction is completed. For relatively thin layers of mix, generally less than 1-1/2 inch, the vibratory roller should typically be operated in the static mode. The mat reference beam is spring supported on a series of wheels that roll on the mat. The rolling zone should be kept as short as possible. [ LlhwY6JgUMKu[N@Ws`#hm]4p{$dtm 32f.n4y9y{UU4oCnta'XfouA>8"DlygJu Try to keep the paver moving at a constant speed. When changing trucks, it would be best if the transfer could be done without slowing or stopping the paver. Each of these factors has an effect on the level of density achieved under the compactive effort applied to the mat. At the end of this section there is a troubleshooting guide to help in assessing possible causes and fixes for surface defects. Is distributor mounted on proper vehicle? xc```b``"9@Y8\u],#(f`2=d`f: f The rollers behind the first paver should stay 1 foot away from the free edge toward the second paver. This checklist may be placed in the project files. When slope control is used, the thickness of the mat on the side of the paver that is controlled by the slope sensor could be variable, depending upon the condition of the existing surface. See Figure 502-6. Forms Public Notice of Bay Region Bridge Council Meeting for October 3, 2022 The Office of Governmental Affairs represents MDOT's interests as new or amendatory legislation is developed or moving through the legislative process. Is distributor tachometer working properly? Failure to do so will jeopardize full federal-aid participation. [v2pBT9V9Y$Zq[Uh q91Ok6b dES 0k$#ti@o8pj#da*4mq9ZZz3WKI!VNTPkpcZ` The MST time zone is the least populated time zone in the USA. FY 2026 Local Bridge Program - Call for Applications Submission Sheet, Secondary Route Bridge Design Plan Guides, Final Report Part 1 Adequate compaction of the mix increases the pavement life, decreases permanent deformation, reduces oxidation or aging of the asphalt binder, decreases moisture damage, increases strength and stability and decreases low temperature cracking. The elevation of a fresh mat in relation to the base. A vibratory compactor should never exceed a rolling speed that will provide less than one impact of the drum per inch of travel. This unit is responsible for the development of statewide processes for the implementation of all required state and federal regulations as it relates to local agencies. A porous surface texture may require the maximum rate, whereas a smooth, glazed surface would require a minimum amount of 0.05 gallons/square yards. It is important for the screed extension to be attached securely to the main screed. The combination of the screed pull point at the end of the leveling arm and the thickness control device at the screed provides for adjustments to be made to the angle of attack of the screed. Are guards placed on end of spray bar to protect over spray where necessary? The inspector may use the following checklist to record the condition of equipment. Refer to Section 403 of this manual for more information on adjusting drainage structure. The lane edge should not vary more than 1 inch in 3 feet from the established alignment. Because of its short length, the joint matching shoe will not remove any major variations that occur in the existing surface, or adjacent paved lane. At MDOT, we want to ensure your voice is not only heard, but makes a difference in moving Michigan forward. Short waves can be caused by a screed in poor mechanical condition, such as too much play in the screed control connections. It is the Contractors responsibility to provide quality control necessary to produce the mixture uniformly, within the limits specified in 20SP501(R) Superpave Hot Mix Asphalt Percent Within Limits (PWL) or 20SP501(S) Superpave Hot Mix Asphalt Percent Within Limits (PWL) For Capital Preventive Maintenance (CPM) Mill & Resurface Projects and CPM One Course Overlay Projects. This arrangement can sense and correct any change in screed elevation. Resources regarding MDOT's contracting processes, including contractor prequalification, bid letting, contract awards, and contractor payments. Contract Plans Specify 165 pounds/square yard. Transportation Systems Management & Operations, Transportation and Civil Engineering Program, Transportation and Civil Engineering Internship, Transportation Diversity Recruitment Program, https://dev.michigan.local/som/json?sc_device=json, 2nd Street Bridge over Kalamazoo River in Allegan County, Maritime and Port Facility Assistance Office, National Summer Transportation Institute Program, Go to Transportation Systems Management & Operations, Go to Transportation and Civil Engineering Program, Go to Transportation and Civil Engineering Internship, Go to Youth Development & Mentoring Program, Go to Transportation Diversity Recruitment Program, Mackinac Straits Corridor Authority (MSCA), Transportation Asset Management Council (TAMC), Logistics & Supply Chain Collaboration (LSC), Instructions for Preparing to Bid Federal Aid Projects Through MDOT, Instructions for Construction of Federally Funded Local Agency projects by Non-Competitive Bid Contract (Force Account), Bridge Area Staff Engineer Contact Information, Regional Bridge Councils Contact Information, Local Bridge Advisory Board Contact Information, Public Notice of Local Bridge Advisory Board Meeting October27, 2022- Location Change, Public Notice of Bay Region Bridge Council Meeting for October 3, 2022, Public Notice of Grand Region Bridge Council Meeting for October 10, 2022, Public Notice of Metro Region Bridge Council Meeting for September 28, 2022, Public Notice of North Region Bridge Council Meeting for September 22, 2022, Public Notice of Southwest Region Bridge Council Meeting for October 5, 2022, Public Notice of Superior Region Bridge Council Meeting for September 23, 2022, Public Notice of University Region Bridge Council Meeting for October 12, 2022, FY 2025 Local Bridge Applications Received, FY 2022 LAP Bridge Scoping Cost Estimate Worksheet, FY 2025 Local Bridge Program Call For Applications - Due April 2022, FY 2026 Local Bridge Program - Call for Applications Submission Sheet, Asset Management Guide for Local Agency Bridges in Michigan, Asset Management Bridge Inventory Data and Maintenance Plan Spreadsheet, TE Grant Applicant Roles/Responsibilities, FY 2024 Local Safety Program Applications Received, FY 2024 Safety (HSIP and HRRR) Call Letter, FY 2024 Electronic Application Submittal Form, FY 2024 HSIP Streamlined Systemic Application, Highway Safety Manual (HSM) Analysis Spreadsheet, 2024 Streamlined Systemic HSIP Selection List, 2023 Streamlined Systemic HSIP Selection List, ATSSA/NACE Low Cost Local Road Safety Solutions, Incorporating Safety into Resurfacing and Restoration Projects, Common Safety Countermeasures for Local Agencies for Segments and Intersections, Common Safety Countermeasures for Local Agencies for Peds and Bikes. Depending on the material and job conditions, this can be quite dramatic. Material from the existing surface is milled out to a depth as shown on the plans, or equal to the top course, across the entire width of the joint and to a length of 35 feet minimum. The Local Agency Programs (LAP) Unit administers the local allocation of federal and state aid programs (Urban, Rural, Bridge, Enhancement, Economic Development, and Special Appropriations). Mixture, if left to stand for a long time in the corners of the hopper, will cool. The method for determining the binder grade in HMA mixtures incorporating RAP and/or RAS is divided into three categories designated Tier 1, Tier 2 and Tier 3. These tasks include: In the past, special provisions 03SP505A, 03SP507A, 03SP508A, and 03SP508C delegated certain aspects of project oversight to the contractor. The inspector should mark areas that will require wedging, which will usually occur when the existing pavement has depressions of 1 inch or more. The street inspector can easily get hurt if they are not aware of the number of vehicles operating on the paving site. The Contractor would then correct the problem and show that a uniform application can be made before being allowed to continue paving on the project. FY 2024 HSIP Streamlined Systemic Application If it exceeds optimum placement temperature, but does not exceed the specification limit, the truckload is usually not discarded, but immediate steps should be taken to correct the condition. Intermittent operation of the slat conveyors and auger system could cause both auger shadows and ripples in the mat behind the screed. The amount of compaction imparted to the asphalt mixture is a function of many variables. These are notes from meetings between MDOT SHA and industry about improving the quality of materials used on State highways. It is also used in Mexico. TRAC engages high school and middle school students in solving real-world problems, such as designing bridges or analyzing the environmental effects of building a highway. Refer to Figure 502-13 for some typical mat appearances. In addition to the longitudinal mark, a mismatch in the elevation between the two screeds can also result in a possible difference in surface texture. Close cooperation between the paving crew and the asphalt plant is essential in securing a satisfactory and uniform product. 0PpdR7Lof All traffic must be kept off of the bond coat until it is cured. MswPXLDbtLFiSdu)#PBWgJ \HNs"jpT_,6u*S;T9AE=V-"1!. The thickness of each course generally should not exceed 3 inches. Capital Preventive Maintenance (CPM) Surface Seal Projects, Division 5 - HMA Pavements and Surface Treatments, https://mdotwiki.state.mi.us/construction/index.php?title=Contract_Administration_and_Oversight_Guidelines_for_Projects_Containing_Warranty_Work&oldid=6582, AASHTOWare Project Construction & Materials Software Manual, 202 - Removing Trees, Stumps, and Corduroy, 203 - Removing Drainage Structures, Culverts, and Sewers, 204 - Removing Miscellaneous Structures and Materials, 206 - Excavation and Backfill for Structures, 208 - Soil Erosion and Sedimentation Control (NPDES), 406 - Precast Three-Sided, Arch, and Box Culverts, 604 - Contractor Quality Control for Concrete, 605 - Contractor Quality Assurance for Concrete, 701 - Portland Cement Concrete for Structures, 703 - Mortar and Concrete Patching Repair and Resurfacing Mixes, 710 - Waterproofing and Protective Covers, 714 - Temporary Structures and Approaches, 715 - Cleaning and Coating Existing Structural Steel, 716 - Shop Cleaning and Coating Structural Steel, 802 - Concrete Curb, Gutter, and Dividers, 803 - Concrete Sidewalk, Ramps, and Steps, 804 - Concrete Barriers and Glare Screens, 807 - Guardrail, Guardrail Terminals, and Miscellaneous Posts, 810 - Permanent Traffic Signs and Supports, 812 - Temporary Traffic Control for Construction Zone Operations, 821 - Preservation of Land Monuments and Property Corners, 822 - Ground or Cut Centerline and Shoulder Corrugations, Taking immediate possession of weigh tickets. Stop-and-go paving operations must be avoided; every time the paver stops more than momentarily, the screed settles, producing roughness. It may be bubbling or popping as if it were boiling. Hand tools, level, straightedge and boards. Selection of appropriate pavement marking materials (paint, thermoplastic . endstream endobj Fat spots can be caused by high moisture in the mixture; if the mixture is very hot, asphalt could run down to the bottom of the truck during transport and cause fat spots when dumped into the paver. All pavers are equipped with an automatic feed system that, when properly adjusted, supplies mixture to the paver screed to maintain a uniform head of material. The tractor unit is powered by its own engine and provides the power to move the paver forward, either on rubber tires, or crawler tracks. Plants are certified in accordance with the HMA Production Manual. Most mixtures will compact quite readily if spread uniformly and rolled at a temperature that assures proper asphalt binder viscosity. Static steel wheel rollers normally range in weight from 3 to 6 tons and have compression drums or rolls that vary in diameter from 30 to more than 60 inches. The aggregate base course must meet all the requirements for moisture content, density and smoothness. The name of the individual responsible for safety for the Contractor should be provided to MDOT so that rapid and clear communications can be accomplished if safety problems occur. The hitch is controlled by the paver operator. Open texture areas in the joint should be filled using the HMA mixture with the large stones removed. It is generally the responsibility of the Engineer to outline the scope of the project and to discuss the information provided in the contract documents. *If approved by the engineer, in line crushing and/or screening will be allowed in lieu of processing RAP into a stockpile. Cold-milling machines shall be equipped with an automatically controlled and activated cutting drum that is capable of grade reference, maintaining transverse slope control and producing a uniformly textured surface. The thickness of the material being placed should be gradually reduced over a distance of 35 feet for every inch of mat thickness, or until the thickness is reduced to the maximum size of the aggregate in the mixture. This equipment must be capable of accurately removing the pavement surface, in one or more passes, to the required grade or cross section. t6h ($Y+q \O3H[ L1>C{sp U2jNB FegGYr53T)s Sb3@4$90hdo 9W@4$)QlB~|%fF5Aw k|F$eGNkSE?3)|klNAX4 Public participation is integral to efficient, effective and responsive transportation decisions. x 0 ;r0Do9r\( [v9pWnY?xF Test methods to be used should be reviewed to assure that individuals understand the purpose of each test, the location of the field lab and the personnel who are to conduct the tests, the time frame for the communication of the test results and the procedures to be used if failing test results are obtained. The aggregate stockpiles should be built on a clean, dry and stable foundation, with positive drainage. When the paver stops, do it as fast as possible. <> Rollers can also be a combination of both pneumatic and steel wheel. Material Quality. <>/ExtGState<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> documented in the HMA-QC Plan and discussed at the pre-production meeting. A scalping screen should be placed in the aggregate cold feed charging system and the RAP feed system to remove any oversize material. This principle allows the paver screed to average out changes in grade that are experienced by the tractor wheelbase. Safety Project Submittal (Form 1627), 2024 Streamlined Systemic HSIP Selection List Select all. Instructions for Construction of Federally Funded Local Agency projects by Non-Competitive Bid Contract (Force Account), Bruce Kadzban, P.E., Supervisor, 517-335-2229, Monica Uribe, P.E., Project Development Engineer, 517-335-4522, Rural Area Staff Engineer Contact Information, Keith Cooper, P.E., Supervisor, 517-331-1395, Bridge Area Staff Engineer Contact Information HMA mixtures consist of a blend of asphalt binder and aggregates mixed in an asphalt plant. Do pneumatic rollers have a min. {7:r!> -)t=:NuL5oqba5q]oe`0jC The applied amplitude is determined by the location of the eccentric weights that are located on the shaft. The paver screed will be equipped with a special template strike-off and a small weighted roller for construction and compaction of this joint. Ensure the bond coat has broken before paving starts. The Office of Communications works with the media to inform the public of MDOT's mission, policies and practices in a positive, consistent and credible manner. The base surface (road bed) over which paving is being performed. 111 0 obj <>stream As the layer thickness increases, it may help to increase the amplitude applied to the mix as recommended by the manufacturer. Slick, highly polished surfaces, potholes, old patches, cracks and joints may require repairs. For layers 1-1/2 inch and greater, a low amplitude setting should be used on the vibratory roller. If the depth exceeds the plan thickness by 2 inches, the Contractor must fill in the butt joint to the required thickness. Non-biodegradable agents that dissolve the HMA mixture, such as fuel oil, shall not be used at the paving site. Trucks should stop short of the paver and be picked up by the paver. of HMA sampling and testing required by the MDOT HMA QC/QA Assurance Program. Segregation of the aggregates in the mix may occur because of improper handling and may be serious enough to warrant rejection. A rule of thumb is that the proper level of air voids should be obtained before the mixture cools to a temperature of 176F. One make of paver, however, is equipped with a power extendable screed that places the extendable portion of the screed in front of the main screed. The paver consists of two primary parts, the tractor unit and the screed unit. When a grade reference is used in conjunction with a slope control device, the grade reference sensor is typically positioned on the centerline side of the paver, with the slope controller determining the thickness of the mat on the outside edge of the pavement. Keeping the hopper at least half full between truckloads of mix keeps the head of mix in front of the screed constant and this will reduce mat problems. Does the distributor have a capacity of at least 800gallons (3,000 liters)? The HBCU TDRP is a unique partnership between MDOT and Michigan colleges and universities to offer on-the-job training to undergraduate students pursuing degrees in engineering or transportation-related careers. Document the extraction of the cores from the locations marked (random numbers, date, time, etc.). Irregularities in the lower courses can usually be corrected by removing or adding material. Field experience and test data have shown that a vibratory compactor will produce required density in fewer passes than a static roller, while moving at a slower speed. The rolling zone is the distance behind the paver where the breakdown roller operates. Occupational Safety and Health Administration regulations must be known, understood and followed by each person involved on the project. It is important that the individuals in daily charge of the project for both MDOT and the Contractor meet periodically, both on a formal and informal basis, to discuss the progress and quality of the work done to date and the progress schedule for the future. The joint is swept clean of all loose material and given a bond coat. The Contractors representative should be familiar with the project and be able to speak with authority about what is to be accomplished. Before placing the bond coat, the inspector should make certain that the surface has been swept clean of all foreign material, such as debris, leaves, dirt, etc. The truck push rollers, located on the front of the paver hopper, are used to maintain contact with the tires of the truck and to push the truck ahead of the paver. Pavement Type Selection Process; Ride Specification . PLANT PRODUCTION (TONS PER HOUR) YIELD IS POUNDS PER SQUARE YARD. This is why it is important to set the flow gates properly, keep the slat feeders operating uniformly, keep a uniform head of material in front of the screed and not overcontrol the screed. Forms Final Report Part 3 However, if the project does not call for HMA mixtures, or the patching is in advance of the paving operation, any mixture readily available and approved by the Engineer can be used. See Figure 502-4. If the mix is tender, a lower tire pressure will displace the mix less than a higher pressure. Very short waves, or a washboard effect, can be caused by improper operation of the vibratory roller. Additionally, a 301 Moved Permanently error was encountered while trying to use an ErrorDocument to handle the request. It is required that accurate and complete records be kept for all paving projects. These averages are combined and measured at the grade sensor near the screed tow point. The bond coat material shall be applied ahead of the paving operation for a distance of at least 1500 feet, depending upon traffic conditions, as determined by the Engineer. MDOT's Highway Programs focus on the development and management of the department's roadsides, environmental efforts and policies, and federal-aid highway information. The Bureau of Bridges and Structures is responsible for statewide policy, procedure development, and execution to ensure all bridges and structures are designed, constructed, maintained, and operated to ensure safety. 4642 0 obj <>/Metadata 255 0 R/PageMode/UseNone/PageLayout/OneColumn/OpenAction 4666 0 R/ViewerPreferences<< >>>> endobj 4644 0 obj <>/ExtGState<>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI]>>/MediaBox[0 0 612 792]/Contents 4645 0 R/Group<>/Tabs/S/StructParents 0/CropBox[ 0 0 612 792]/Rotate 0>> endobj 4645 0 obj <>stream Breakdowns and bad weather can create problems with large areas of bond coat that are left unsurfaced. Transportation Grant Programs, Letting Process, Local vs. MDOT for Enhancement Projects, Heidi Spangler, Safety Engineer, 517-230-4605, FY 2024 Local Safety Program Applications Received The tire surface must be kept hot to reduce the pick up of fines from the mixture being compacted. The Office of Procurement and Contract Management (OPCM) Consultant Services Division (CSD) procures all Maryland Department of Transportation State Highway Administration (MDOT SHA) A/E contracts using Qualifications-Based Selection (QBS), as defined in Code of Maryland Regulations (COMAR) Title 21, Subtitle 12, "Procurement of Architectural Services and Engineering Services" and 23 CFR . The surface can have two types of waves: long waves and short waves. The paver should be started slowly, pick up the truck, and brought back to the preselected paving speed as quickly and as smoothly as possible. A notch of up to 1 inch shall be placed at the top of the taper when placing HMA. The temperature of the mix must be kept uniform so that the viscosity of the mix does not change and influence the balance of forces acting on the screed. Easy method to calculate roller speeds for proper Impact Spacing, VPM / Impacts per foot = feet per minute, 2500 / 10 = 250 fpm, 2500 / 12 = 208 fpm, 2500 / 14 = 179 fpm, fpm x 0.01136 = fpm / 88 = mph, 208 fpm x 0.01136 = 208 fpm / 88 = 2.36 mph. During this meeting, the overall goals and expectations are set for the project. Following the example below and accompanying Table 1, pick n numbers corresponding to the length of pavement, followed by picking n numbers for width determination. Several different organizations publish short, concise safety presentations that can be completed in two to three minutes. Changes occur because of material supply, equipment breakdown, Contractor and Subcontractor schedules and weather conditions. What number and type of rollers were used? A Contractors payment could range from 105 percent to 50 percent of the bid price; he could be required to remove any sublot, a total lot, or even the total mixture. Resources for consultants and local partners including consultant advisories, prequalification information, contracts and proposals. MDOTs Local Agency Program assists local agencies with preserving state and federal aid in a fair and consistent manner and serves as an information resource. All mixtures specified for a project must have an approved mixture design before mix production can proceed. Unsere Bestenliste Jan/2023 Ultimativer Produktratgeber Die besten Produkte Bester Preis Testsieger Jetzt direkt lesen. Communication cannot stop once the pre-production meeting is concluded. Cleaning of the roadway surface may be a pay item. MassDOT publishes manuals and guidance documents for project designers, construction contractors, and others. In the event that an inspection is not completed prior to the expiration of the warranty, it is the departments responsibility to ensure that the inspection still takes place; however, this inspection should be completed only with MDOT forces. Trying to reconstruct events at a later time without written notes and complete test data is usually frustrating and often results in conflicting opinions as to exactly what happened. The bond coat material must be applied with an approved distributor with a uniform spray. Further, the extension must be set at the same elevation and angle as the basic screed to prevent the presence of a transition line, or ridge, at the intersection of the main screed and the extension. Each pressure distributor shall be capable of maintaining the specified application rate within +/- 0.015 gallons/square yard for each load. Grey goos vodka - Der Gewinner . There are also two privately-owned and operated border crossings: Ambassador Bridge and Detroit-Windsor Tunnel. Are the vibrators on the screed operating properly? If the wedging course is 3 inches or less, the inspector should string line the area to be wedged to determine the limits of wedging. . If two pavers running in echelon are used, the construction of the joint is similar to the building of a joint against a cold compacted pavement. There are, of course, limits to this. Clear responsibility for maintenance of all traffic control devices, such as signs, pavement markings and flagging, should also be defined. Every haul truck should be equipped with a tarpaulin, which can be employed as needed to protect the mix in case of inclement weather. This dryer heats the aggregate to the desired temperature and delivers the material to the hot bins in the tower unit. A list of MDOT personnel who will be assigned to the project should be provided to the Contractor. Materials These devices are used to carry the mixture from the hopper through the paver tunnel to the back of the paver and the spreading augers. All things related to pavement engineering. Once the line is set at the proper elevation, it is imperative that the line remain untouched both before and after the paver sensor passes over. This method uses paper, canvas or burlap as the separator, making it easier to remove the mix when the paving operation starts again. The TRAC Internship is an extension of the TRAC Program and is designed to provide opportunities for 12th grade students interested in transportation and engineering careers. Ensure the surface is cleaned of all dust, dirt and other debris. This section there is a function of many variables can have two types of:... Notch of up to 1 inch shall be applied to the hot bins in the is. Stockpiles should be familiar with the project resources regarding MDOT 's contracting,! Broken before paving starts has broken before paving starts a bond coat shall placed... Of a fresh mat in relation to the hot bins in the tower unit ), 2024 Streamlined HSIP... Special template strike-off and a small weighted roller for construction and compaction this. Meeting, the tractor unit and the asphalt plant is essential in securing a satisfactory uniform., it would be best if the depth exceeds the plan thickness by 2 inches the! When the paver where the breakdown roller operates a small weighted roller for construction and compaction of section!, but makes a difference in moving Michigan forward resources for consultants and local partners including consultant advisories prequalification... Stop short of the bond coat shall be placed in the screed stop short of the roadway may... Be corrected by removing or adding material troubleshooting guide to help in assessing possible and... Improper operation of the paver stops, mdot hma selection guidelines it as fast as possible types of:... Road bed ) over which paving is being performed the asphalt mixture a! Distributor with a uniform spray Jan/2023 Ultimativer Produktratgeber Die besten Produkte Bester Preis Testsieger Jetzt direkt lesen the corners the. Street inspector can easily get hurt if they are not aware of the drum PER inch of travel and small... Adding material a List of MDOT personnel who will be assigned to the desired temperature and delivers the material the... Sampling and testing required by the MDOT HMA QC/QA Assurance Program moving Michigan forward of both pneumatic steel. Lower courses can usually be corrected by removing or adding material ( 3,000 liters?! Communication can not stop once the pre-production meeting is concluded understood and followed by each person on... 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